Migrating corrosion inhibitor based on organic amines for protecting steel reinforcement in concrete

The work aims to evaluate the efficiency of migrating corrosion inhibitor based on organic amines called HAENYTEX Protectoseal Ci in relation to steel reinforcement in concrete. Specimens of fine-grained concrete reinforced with steel rods with a diameter of 5 mm and a length of 120 mm were tested. During the manufacture of specimens, calcium chloride was introduced into the concrete composition in order to reduce the passivation effect of concrete. Three series of specimens were prepared: without inhibitor, with inhibitor applied to the specimens’ surface, with inhibitor applied to the specimens’ surface and moistening them with water. Determination of the passivation effect of concrete treated with the studied inhibitor in relation to steel reinforcement was carried out using an accelerated electrochemical method. The current density in specimens without migrating corrosion inhibitor increased by 26% and 196% after 90 days and 180 days of exposure to alternating wetting and drying on concrete, respectively, which indicates that corrosion is progressing. The inhibitor HAENYTEX Protectoseal Ci demonstrated the ability to provide a passive state of reinforcement in concrete. The current density for concrete specimens with the inhibitor applied to the surface was 9.66 μA/cm2, 0.94 μA/cm2 and 0.65 μA/cm2 in the initial state, after 90 days and after 180 days of exposure to alternating wetting and drying on concrete. © 2024, Russian Association of Corrosion Engineers. All rights reserved.